chore: Fix linting google_ai (#2256)

* Fix linting

* escape the period

Author: sjrl

integrations/google_ai/tests/generators/test_gemini.py

@@ -35,7 +35,7 @@ def test_init(monkeypatch):
 
 
 def test_init_fails_with_tools():
-    with pytest.raises(TypeError, match="GoogleAIGeminiGenerator does not support the `tools` parameter."):
+    with pytest.raises(TypeError, match=r"GoogleAIGeminiGenerator does not support the `tools` parameter\."):
         GoogleAIGeminiGenerator(tools=["tool1", "tool2"])